Sqlite learning notes 9: Using sqlite to insert data in C language, sqlite learning notes

Sqlite learning notes 9: Using sqlite to insert data in C language, sqlite learning notes

I have created a table before. Now I want to insert some data into the table. The data inserted is similar to that in the table creation. The SQL language is different. The complete code is as follows:

#include <stdio.h>#include <stdlib.h>#include "sqlite/sqlite3.h"#define DB_NANE "sqlite/test.db"sqlite3 *db = NULL;char* sql = NULL;char *zErrMsg = NULL;int ret = 0;typedef enum{    false,    true} bool;/*typedef int (*sqlite3_callback)(void*,    Data provided in the 4th argument of sqlite3_exec()int,      The number of columns in rowchar**,   An array of strings representing fields in the rowchar**    An array of strings representing column names);*/static int callback(void *NotUsed, int argc, char **argv, char **azColName){    int i = 0;    for(i=0; i < argc; i++){        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");    }    printf("\n");        return 0;}bool connectDB(){    ret = sqlite3_open(DB_NANE, &db);        if( ret != SQLITE_OK){        fprintf(stderr, "Error open database: %s\n", sqlite3_errmsg(db));        sqlite3_free(zErrMsg);                return false;    }        fprintf(stdout, "Successfully opened database\n");    return true;}bool createTable(){    /* Create SQL statement */    sql = "CREATE TABLE COMPANY("  \    "ID INT PRIMARY KEY     NOT NULL," \    "NAME           TEXT    NOT NULL," \    "AGE            INT     NOT NULL," \    "ADDRESS        CHAR(50)," \    "SALARY         REAL );";        /* Execute SQL statement */    ret = sqlite3_exec(db, sql, callback, 0, &zErrMsg);    if( ret != SQLITE_OK ){        fprintf(stderr, "Error SQL: %s\n", zErrMsg);        sqlite3_free(zErrMsg);                return false;    }        fprintf(stdout, "Successfully table created\n");        return true;}

/* Added this function */bool insertRecords () {/* Create SQL statement */SQL = "INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "\" VALUES (1, 'Paul ', 32, 'california', 20000.00); "\" insert into company (ID, NAME, AGE, ADDRESS, SALARY) "\" VALUES (2, 'allen ', 25, 'texas', 15000.00); "\" insert into company (ID, NAME, AGE, ADDRESS, SALARY) "\" VALUES (3, 'Teddy ', 23, 'norway', 20000.00); "\" INSERT INTO COMPANY (ID, NAME, AGE, ADDRESS, SALARY) "\" VALUES (4, 'mark', 25, 'Rich-Mond, 65000.00 );"; /* Execute SQL statement */ret = sqlite3_exec (db, SQL, callback, 0, & zErrMsg); if (ret! = SQLITE_ OK) {fprintf (stderr, "SQL error: % s \ n", zErrMsg); sqlite3_free (zErrMsg); return false;} fprintf (stdout, "successfully records created \ n"); return true ;}

bool closeDB(){    int ret = 0;    ret = sqlite3_close(db);    if ( ret == SQLITE_BUSY ){        return false;    }        return true;}int main(int argc, char* argv[]){    connectDB();    /*createTable();*/    insertRecords();    closeDB();        return 0;}

How does C language insert variables into the SQLite database ??

To use the bind function, see "query parameterization"

How to operate sqlite databases in C language in linux

Please char * SQL = "CREATE TABLE SensorData (ID INTEGER PRIMARY KEY, SensorID INTEGER, SiteNum INTEGER, Time VARCHAR (12), SensorParameter REAL );";
Here is your SQL statement
Implicit conversion bit const char * SQL
You will assign a value to the SQL statement later, that is, it is strange to write the. rodata segment without a segment error.

If you want to use the original buff char SQL statement to allocate a large buff [512];
Either Dynamic Allocation (unnecessary)